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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b088dbfa74c566fe136c48cbebc38755564562f49b053ce3015394ab9bc09b' 
  AND token = '4PMJugS+rMgghf8bk0j3OIEDnoYlV63er0Jt+Otmhzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}